"Scientists discover an organizing principle for our sense of smell." September 26th, 2011. http://medicalxpress.com/news/2011-09-sc...ciple.html

See also: Smelling a single component of male sweat alters levels of cortisol in women

Both articles come from Noam Sobel's group, and he is one of the well respected investigators into human pheromones with whom I share a history that extends back to the mid-1990's.